Okay, so I bought a new to me coop Tuesday and it came with 5 chickens. I saw one had a bit of a goopy butt. So I looked closer, and a chunk of what I can only assume was old poop and bedding was stuck to her butt feathers. I got it off. But I did see that her butt feathers are rather dirty and goopy, and the other birds appear the same. Her vent was very clean and not swollen, and I am fairly sure she is laying fine. I got 4 eggs Wed and 3 Thurs, so not bad for 5 just uprooted chickens, I would think. Several of them were also picking at each other's butt feathers last night when they went to bed. I looked up pics on mites vs. lice, etc., and it appears to be mites. I am going to bathe everyone and then treat the coop as well as the birds. I will have a better idea of the bug once I bathe. My question- which is better, Sevin dust or the permethrin powder for mites? I am buying both to have them on hand. Also what is the withhold period for both in regards to eggs? And if there is a period, can I feed the eggs to the dogs, or boil and feed back to the chickens? Thanks so much, BYC is awesome!